Maximal signal bandwith for the usrp

Dear all,

According the USRP v4 description:

http://www.ettus.com/downloads/usrp_v4.pdf
http://www.ettus.com/downloads/usrp_v4.pdf

the usrp is able to process signals up to 16MHz.

As the USB port is limited to 60MB/s, and if the samples are coded on 32
bits (16 for Q and 16 for I), the maximal bandwidth equals 15MHz.

Which version is correct?

Furthermore, considering that the first ADC works at 64Ms/s, the
available rate for the USB equals:

32/2 (is it available ?)

32/3

32/4

32/5

32/256

Am I right ?

Thank you for your answers,

Pierre Jallon

JALLON Pierre 201932 wrote:

As the USB port is limited to 60MB/s, and if the samples are coded on 32
bits (16 for Q and 16 for I), the maximal bandwidth equals 15MHz.
The USRP can code signals as 32 bits (16 for Q and 16 for I)
In this case the usrp is able to process signals up to 8 MHz.
The USRP can also code signals as 16 bits (8 for Q and 8 for I)
In that case the usrp is able to process signals up to 16 MHz.
32/2 (is it available ?)

Am I right ?
the first ADC works at 64Ms/s, the
available rate for the USB equals:
64/4 (64/4 is only available with halfband filter disabled)
64/8
64/12
64/16
64/20

64/256

The halfband filter in the usrp firmware has a minimal decimation rate
of 8. That is why 64/4 is only available with halfband disabled.

Martin

JALLON Pierre 201932 schrieb:

As the USB port is limited to 60MB/s

That is net bandwith. You have to subtract the overhead. Moreover you
have to find chipsets that really support this rate.

Currently 32MB/s is a achievable value for the USRP.

Patrick

Engineers motto: cheap, good, fast: choose any two
Patrick S.
Student of Telematik, Techn. University Graz, Austria

Hi,

USRP can transfer data at maximum of 32MB/s using its USB2. When the
data
are 16 bit wide (16bit I and 16 bit Q) then maximum complex transfered
data
will be 8 Msps which gives idealy maximum 8 MHz bandwidth. However, if
we
use 8 bit data wide ( 8bit I, and 8bit Q), then maximum transfer will be
16
Msps complex data. This means, the USRP can process signals up to 16
MHz.

Firas

JALLON Pierre 201932 wrote:

the usrp is able to process signals up to 16MHz.

32/5

http://lists.gnu.org/mailman/listinfo/discuss-gnuradio


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